Fixed Inductors

Part Number	Description / PDF	Quantity
CML0306-6N2-JNH Delta Electronics	FIXED IND 6.2NH 250MA 600 MOHM	0
0402HM-430EJTS Delta Electronics	FIXED IND 43NH 250MA 700 MOHM	7950
0805CS-720EGTS Delta Electronics	FIXED IND 72NH 500MA 400 MOHM	3669
0402HP-2N2ECTS Delta Electronics	FIXED IND 2.2NH 2.1A 38 MOHM SMD	7243
CML0306-0N8-SNH Delta Electronics	FIXED IND 0.8NH 850MA 100 MOHM	0
0402HM-9N1EHTS Delta Electronics	FIXED IND 9.1NH 540MA 140 MOHM	7900
SDET25201B-4R7MS Delta Electronics	FIXED IND 4.7UH 1.25A 210MOHM SM	3761
HMLE20160H-2R2MDR Delta Electronics	FIXED INDUCTOR 2.2UH	4000
0402HP-180EGTS Delta Electronics	FIXED IND 18NH 900MA 120 MOHM	6873
0402HC-3N6EDTS Delta Electronics	FIXED IND 3.6NH 900MA 40 MOHM	7512
VCMT104T-220MN5 Delta Electronics	FIXED IND 22UH 4.6A 68MOHM SMD	280
0402HP-430EJTS Delta Electronics	FIXED IND 43NH 450MA 520MOHM SMD	6840
0402HM-240EGTS Delta Electronics	FIXED IND 24NH 280MA 520 MOHM	7910
0402HP-4N3EDTS Delta Electronics	FIXED IND 4.3NH 1.6A 45 MOHM SMD	8000
0402HS-9N0EJTS Delta Electronics	FIXED IND 9NH 680MA 104 MOHM SMD	8000
0402HS-110EGTS Delta Electronics	FIXED IND 11NH 640MA 120 MOHM	7680
0805CS-120EJTS Delta Electronics	FIXED IND 12NH 600MA 150 MOHM	3980
0402HP-6N8EGTS Delta Electronics	FIXED IND 6.8NH 1.5A 55 MOHM SMD	7190
0402HM-2N4EDTS Delta Electronics	FIXED IND 2.4NH 850MA 50MOHM SMD	8000
0805CT-390EJTS Delta Electronics	FIXED IND 39NH 600MA 330 MOHM	3445

Fixed Inductors

1. Overview

Fixed inductors are passive electronic components designed to store energy in magnetic fields when electrical current flows through them. Unlike variable inductors, their inductance values remain constant during operation. These components play critical roles in filtering, signal processing, energy storage, and electromagnetic interference (EMI) suppression across modern electronics, including power supplies, communication systems, and automotive electronics.

2. Main Types and Functional Classification

Type	Functional Characteristics	Application Examples
Wirewound Inductors	High precision, high current handling, low resistance	Power supplies, DC-DC converters
Chip Inductors	Compact SMD package, stable performance at high frequencies	Mobile devices, RF circuits
Ferrite Bead Inductors	Effective high-frequency noise suppression	EMI filtering in digital circuits
Thin-Film Inductors	Ultra-compact, high Q-factor, tight tolerance	5G communication modules, IoT devices

3. Structure and Composition

Typical fixed inductors consist of:

Magnetic Core: Made from ferrite, powdered iron, or composite materials to concentrate magnetic flux
Coil Structure: Copper wire wound around the core (enamelled or silver-plated)
Encapsulation: Molded resin or ceramic coating for mechanical protection and insulation
Terminations: Solder-coated ends for PCB mounting (for SMD types) or leaded connections

4. Key Technical Specifications

Parameter	Description	Importance
Inductance (L)	Measured in henrys (H), determines energy storage capacity	Defines filtering/energy storage performance
Rated Current (I_rated)	Maximum DC current before saturation	Prevents core saturation and failure
DC Resistance (DCR)	Resistance of coil windings	Affects efficiency and thermal performance
Self-Resonant Frequency (SRF)	Frequency where inductor behaves as capacitor	Limits effective operating frequency range
Q Factor	Quality factor indicating efficiency	Higher Q = lower energy losses

5. Application Fields

Consumer Electronics: Smartphones, laptops, LED drivers
Industrial Equipment: Motor drives, power inverters
Automotive Systems: ECU modules, EV battery management
Telecom Infrastructure: Base station filters, optical transceivers

6. Leading Manufacturers and Products

Manufacturer	Representative Product	Key Features
Murata	LQH3NPN100M	10 H, 1.2A, 1.8 1.4mm chip inductor
TDK	MLZ2012A100T	100MHz SRF, 1.0 1.25mm for RF circuits
Vishay	IHLP2525CZER1R0M	1 H, 12A, composite construction
Coilcraft	0402DC-103J	10 H, 5% tolerance, ultra-low profile

7. Selection Guidelines

Key considerations during selection:

Calculate required inductance based on switching frequency and ripple current
Verify rated current exceeds maximum operating current by 20-30%
Select SRF higher than circuit operating frequency
Consider package size vs. thermal dissipation requirements
For EMI suppression: Choose ferrite beads with impedance curves matching target frequencies

8. Industry Trends

Current development trends include:

Miniaturization: Sub-0.5mm size inductors for wearable devices
High-Frequency Operation: Components supporting >10GHz 5G applications
Integrated Solutions: Combined inductor-filter modules
Material Innovation: Nanocrystalline cores for higher saturation flux
Automotive Focus: AEC-Q qualified parts for EV/HEV systems